Coprecipitation of gold(III) complex ions with manganese(II) hydroxide and their stoichiometric reduction to atomic gold (Au(0)): Analysis by Mössbauer spectroscopy and XPS.

Coprecipitation of gold(III) complex ions with manganese(II) hydroxide and their stoichiometric reduction to atomic gold (Au(0)): Analysis by Mössbauer spectroscopy and XPS. Research Abstract Details 

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Coprecipitation of gold(III) complex ions with manganese(II) hydroxide and their stoichiometric reduction to atomic gold (Au(0)): Analysis by Mössbauer spectroscopy and XPS. Abstract Text:

Mamiko Yamashita,Hironori Ohashi,Yasuhiro Kobayashi,Yoshihiro Okaue,Tsutomu Kurisaki,Hisanobu Wakita,Takushi Yokoyama,Mamiko Yamashita,Hironori Ohashi,Yasuhiro Kobayashi,Yoshihiro Okaue,Tsutomu Kurisaki,Hisanobu Wakita,Takushi Yokoyama,

To elucidate the formation process of precursor of gold-supported manganese dioxide (MnO(2)), the coprecipitation behavior of [AuCl(4-n)(OH)(n)](-) (n=0-4) (Au(III)) complex ions with manganese(II) hydroxide (Mn(OH)(2)) and the change in their chemical state were examined. The Au(III) complex ions were rapidly and effectively coprecipitated with Mn(OH)(2) at pH 9. According to the Mössbauer spectra for gold (Au) coprecipitated with Mn(OH)(2), below an Au content of 60 wt% in the coprecipitates, all of the coprecipitated Au existed in the atomic state (Au(0)), while, above an Au content of 65 wt%, part of the gold existed in the Au(III) state, and the proportion increased with increasing coprecipitated Au content. Based on the results of X-ray photoelectron spectroscopy, Mn(II) in Mn(OH)(2) converted to Mn(IV) in conjunction with coprecipitation of Au(III) complex ions. These results indicate that the rapid stoichiometric reduction of Au(III) to Au(0) is caused by electron transfer from Mn(II) in Mn(OH)(2) to the Au(III) complex ion through an MnOAu bond.

Coprecipitation of gold(III) complex ions with manganese(II) hydroxide and their stoichiometric reduction to atomic gold (Au(0)): Analysis by Mössbauer spectroscopy and XPS. Publishing Authors By Initials

M Yamashita,H Ohashi,Y Kobayashi,Y Okaue,T Kurisaki,H Wakita,T Yokoyama,M Yamashita,H Ohashi,Y Kobayashi,Y Okaue,T Kurisaki,H Wakita,T Yokoyama,

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Coprecipitation of gold(III) complex ions with manganese(II) hydroxide and their stoichiometric reduction to atomic gold (Au(0)): Analysis by Mössbauer spectroscopy and XPS. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of colloid and interface science

VOLUME: 319

Page Numbers: 25-9

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ISSN: 0021-9797

DAY: 11

MONTH: 12

YEAR: 2007

Coprecipitation of gold(III) complex ions with manganese(II) hydroxide and their stoichiometric reduction to atomic gold (Au(0)): Analysis by Mössbauer spectroscopy and XPS. Information

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LANGUAGE: eng

NlmUniqueID: 43125

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Grant and Affiliation Information for Coprecipitation of gold(III) complex ions with manganese(II) hydroxide and their stoichiometric reduction to atomic gold (Au(0)): Analysis by Mössbauer spectroscopy and XPS.

AFFILIATION: Department of Chemistry, Faculty of Science, Kyushu University, Ropponmatsu, Chuo-ku, Fukuoka 810-8560, Japan.

Country: United States

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MEDLINETA: J Colloid Interface Sci

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